STOCK TITAN

Shattuck Labs (STTK) director Clay Siegall buys 62,500 shares at $4

Filing Impact
(Moderate)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

Shattuck Labs director Clay B. Siegall bought 62,500 shares of the company’s common stock in an open-market transaction at $4.00 per share. After this purchase, he directly owns 318,608 shares. The footnote explains the shares were purchased in connection with the company’s underwritten offering that closed on June 11, 2026.

Positive

  • None.

Negative

  • None.
Insider SIEGALL CLAY B
Role null
Bought 62,500 shs ($250K)
Type Security Shares Price Value
Purchase Common Stock 62,500 $4.00 $250K
Holdings After Transaction: Common Stock — 318,608 shares (Direct, null)
Footnotes (1)
  1. [object Object]
Shares purchased 62,500 shares Open-market purchase on June 9, 2026
Purchase price $4.00 per share Common Stock transaction
Shares owned after transaction 318,608 shares Direct holdings following purchase
open-market purchase financial
"transaction_action: open-market purchase"
An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.
underwritten offering financial
"purchased in connection with the Issuer's underwritten offering"
An underwritten offering is when a bank or group of banks agrees to buy all of a company's new shares or bonds and then resell them to outside investors, guaranteeing the company will raise a specific amount of money. It matters to investors because it adds certainty that the funding will close while increasing the number of shares or debt in the market, which can lower the price per share and change each existing owner's ownership percentage—think of a wholesaler buying an entire shipment from a maker before it reaches stores.
Common Stock financial
"security_title: Common Stock"
Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.
Form 4 regulatory
"INSIDER FILING DATA (Form 4)"
Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.
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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
SIEGALL CLAY B

(Last)(First)(Middle)
C/O SHATTUCK LABS, INC.
500 W. 5TH STREET, SUITE 1200

(Street)
AUSTIN TEXAS 78701

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Shattuck Labs, Inc. [ STTK ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/09/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock06/09/2026P(1)62,500A$4318,608D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents shares of the Issuer's common stock purchased in connection with the Issuer's underwritten offering, which closed on June 11, 2026.
/s/ Andrew R. Neill, Attorney-in-Fact for Clay B. Siegall06/11/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did STTK director Clay B. Siegall report?

Director Clay B. Siegall reported buying 62,500 shares of Shattuck Labs common stock. The shares were acquired in an open-market purchase at $4.00 per share, increasing his direct holdings to 318,608 shares after the transaction.

At what price did Clay B. Siegall buy Shattuck Labs (STTK) shares?

Clay B. Siegall bought Shattuck Labs common stock at $4.00 per share. This price applied to all 62,500 shares purchased in the open-market transaction disclosed, according to the insider Form 4 data provided.

How many Shattuck Labs (STTK) shares does Clay B. Siegall own after this trade?

Following the reported purchase, Clay B. Siegall directly owns 318,608 shares of Shattuck Labs common stock. This figure reflects his total direct holdings immediately after acquiring 62,500 shares in the open-market transaction.

Was the STTK insider share purchase linked to an underwritten offering?

Yes. The footnote states the 62,500 shares of Shattuck Labs common stock were purchased in connection with the company’s underwritten offering, which closed on June 11, 2026, tying the insider buy to that capital-raising event.

What type of transaction code was used for the STTK insider trade?

The transaction used code P, which indicates an open-market or private purchase of common stock. This means Clay B. Siegall actively bought 62,500 shares rather than receiving them as a grant, award, or derivative exercise.